US 7,608,359 B2Granted

Battery

AssigneeSony Corporation

InventorsKazuhito Hatta, Takahiro Endo, Tsuyonobu Hatazawa, Yuzuru Fukushima

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Abstract

Provided is a battery capable of preventing the entry of water even if a sealing width is reduced. A battery element comprising a cathode and an anode is accommodated in a film-shaped casing. The casing includes a metal layer, a resin layer disposed on a side of the metal layer closer to the battery element with an adhesive layer in between, and a resin layer disposed on a side of the metal layer opposite to the side where the resin layer is formed with an adhesive layer in between. The adhesive layer has a water vapor transmission rate of 800 g/m2·day or less for a thickness of 25 μm at 40° C. and 90% RH and a thickness of 10 μm or less. Thereby, even if the sealing width is reduced, the entry of water into the battery can be prevented.

Claims9

Dependent claims

A battery, comprising:

a battery element including a cathode, an anode, and an electrolyte;
and
a film-shaped case accommodating said battery element including
a) a sealing portion disposed in a edge portion of the case and having a width of 1 mm to 5 mm,
b) a metal layer,
c) a first resin layer disposed on the side of the metal layer closest to the battery element with a thermoplastic layer in between the metal layer and the first resin layer, and
d) a second resin layer disposed on the side of the metal layer farthest from the battery element with an adhesive layer in between the metal layer and the second resin layer;
wherein,
the thermoplastic layer has a thickness of 50 μm or less,
the resin piece is disposed between the casing and the cathode terminal of the battery element and between the casing and the anode terminal of the battery element to prevent the entry of air, and
the adhesive layer has a thickness of 20 μm or less and the adhesive of the adhesive layer includes at least two selected from a group of acrylic adhesives and polyurethane adhesives.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/796,240Filed 9 Mar 2004
Priority: JP P2003-07244517 Mar 2003
Published: US 2004/0229120 A118 Nov 2004
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 50/119
Inorganic material: metals
H01M 50/121
Characterised by the material: organic material
H01M 50/129
Comprising three or more layers: with two or more layers of only organic material

Family

US 2004/0229120 A1Pre-grant publication · published 18 Nov 2004
US 7,608,359 B2This patent

From the US filing history. Foreign family members aren’t listed.

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